I recently bought four of these, after my wife ran over some cactus on one of our rides. I read a previous review, basically saying don’t buy these and the stem was broken, but I never had issues buying stuff from Dick’s in the past, so I bought them anyway. I noticed that on the Presta Valves, the stem lock ships screwed all the way in, if you unscrew this, it will inflate and deflate properly. I replaced a tube last night, and just checked the air this morning, and it’s fine. Maybe the other person just didn’t realize this? Hard to say, but no problems here with mine.
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